01-05-2020, 09:05 PM
(This post was last modified: 01-05-2020, 09:06 PM by Ian Williams.)
I often see blocks with quite deep internal corrosion pits at the base of the water jacket, my guess is that in your case you have areas weakened by corrosion and then pushed in through water freezing at some point. If it is only one or maybe two bores you could probably have sleeves fitted.
Black Art Enthusiast